4CDI

Crystal structure of AcrB-AcrZ complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.7 Å
  • R-Value Free: 0.361 
  • R-Value Work: 0.339 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the Acrab-Tolc Multidrug Efflux Pump.

Du, D.Wang, Z.James, N.R.Voss, J.E.Klimont, E.Ohene-Agyei, T.Venter, H.Chiu, W.Luisi, B.F.

(2014) Nature 509: 512

  • DOI: 10.1038/nature13205
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The capacity of numerous bacterial species to tolerate antibiotics and other toxic compounds arises in part from the activity of energy-dependent transporters. In Gram-negative bacteria, many of these transporters form multicomponent 'pumps' that spa ...

    The capacity of numerous bacterial species to tolerate antibiotics and other toxic compounds arises in part from the activity of energy-dependent transporters. In Gram-negative bacteria, many of these transporters form multicomponent 'pumps' that span both inner and outer membranes and are driven energetically by a primary or secondary transporter component. A model system for such a pump is the acridine resistance complex of Escherichia coli. This pump assembly comprises the outer-membrane channel TolC, the secondary transporter AcrB located in the inner membrane, and the periplasmic AcrA, which bridges these two integral membrane proteins. The AcrAB-TolC efflux pump is able to transport vectorially a diverse array of compounds with little chemical similarity, thus conferring resistance to a broad spectrum of antibiotics. Homologous complexes are found in many Gram-negative species, including in animal and plant pathogens. Crystal structures are available for the individual components of the pump and have provided insights into substrate recognition, energy coupling and the transduction of conformational changes associated with the transport process. However, how the subunits are organized in the pump, their stoichiometry and the details of their interactions are not known. Here we present the pseudo-atomic structure of a complete multidrug efflux pump in complex with a modulatory protein partner from E. coli. The model defines the quaternary organization of the pump, identifies key domain interactions, and suggests a cooperative process for channel assembly and opening. These findings illuminate the basis for drug resistance in numerous pathogenic bacterial species.


    Organizational Affiliation

    Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1GA, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACRIFLAVINE RESISTANCE PROTEIN B
A
1049Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: acrB (acrE)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Multi-Drug Efflux Transporters
Protein: 
AcrB bacterial multi-drug efflux transporter
Find proteins for P31224 (Escherichia coli (strain K12))
Go to UniProtKB:  P31224
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PREDICTED PROTEIN
C
49N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.7 Å
  • R-Value Free: 0.361 
  • R-Value Work: 0.339 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 146.205α = 90.00
b = 146.205β = 90.00
c = 543.207γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
MOSFLMdata reduction
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-30
    Type: Initial release
  • Version 1.1: 2014-05-28
    Type: Database references
  • Version 1.2: 2015-09-23
    Type: Data collection